SRAM i-Brakes, what are they?

I searched this forum for this topic with no results, but if I used the wrong parameters, sorry.
In a similarly computer illiterate fashion, I can't download the technical manuals at the sitehttp://www.sram.com/en/sram/comfort/ibrake/index.php
Are these disc brakes with smooth, "stylish" covers to make them more appealing on city bikes, or
are they drum or roller brakes, or are they an entirely new type of braking system? As always, I'm
looking at possible components if I ever do build that custom commuter-tourer.

Michelle Pfieffer, the Carbon Fiber Wonder Bike: A Kestrel 200 SCI Repainted in glorious mango; Old Paintless, A Litespeed Obed; The Bike With No Name: A Bianchi Eros; RegularBike: A Parkpre Comp Ltd rebuilt as a singlespeed.

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Sram doesn't say so, but I believe it is a drum brake.

I clicked the link for the technical manual and got a 404 Error Message, i.e. the page doesn't exist.

Religion is a good thing for good people and a bad thing for bad people. --H. Richard Niebuhr

It seems to be a sort of "modular" drum brake, akin to the Shimano roller brake. Modular, in that they seem easily removed from the hub. Looks like they're looking to make the iBrake a add-on option for their 3, 5, and 7 speed freewheeling hubs.

this is from the 72 page manual, it is intended for use on "Comfort" bikes. yes its a drum brake

Caution:
• There is a risk of accident if unsuitable forks or
frames are used (see page 55).
• Only 24”/26”/28” wheels are suitable for use.
• The total weight of the bicycle with rider and baggage
may not exceed 125 kilograms.
• The i-BRAKE is not useable for tandems, transport
bicycles, and similar loads.
• The i-BRAKEs must go on the left side viewed from
behind the rear of the bicycle.

"Data is not the plural form of annecdote." "yuo ned to be deadurcated"